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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// IcuHolder is a template that can manage the lifetime of a raw pointer to ensure that it is cleaned up at the correct
// time. The general usage pattern is to aquire some ICU resource via an _open call, then construct a holder using the
// pointer and UErrorCode to manage the lifetime. When the holder goes out of scope, the coresponding close method is
// called on the pointer.
template <typename T, typename Closer>
class IcuHolder
{
public:
IcuHolder(T* p, UErrorCode err)
{
m_p = U_SUCCESS(err) ? p : nullptr;
}
~IcuHolder()
{
if (m_p != nullptr)
{
Closer()(m_p);
}
}
private:
T* m_p;
IcuHolder(const IcuHolder&) = delete;
IcuHolder operator=(const IcuHolder&) = delete;
};
struct UCalendarCloser
{
void operator()(UCalendar* pCal) const
{
ucal_close(pCal);
}
};
struct UEnumerationCloser
{
void operator()(UEnumeration* pEnum) const
{
uenum_close(pEnum);
}
};
struct UDateTimePatternGeneratorCloser
{
void operator()(UDateTimePatternGenerator* pGenerator) const
{
udatpg_close(pGenerator);
}
};
struct UDateFormatCloser
{
void operator()(UDateFormat* pDateFormat) const
{
udat_close(pDateFormat);
}
};
struct UNumberFormatCloser
{
void operator()(UNumberFormat* pNumberFormat) const
{
unum_close(pNumberFormat);
}
};
struct ULocaleDisplayNamesCloser
{
void operator()(ULocaleDisplayNames* pLocaleDisplayNames) const
{
uldn_close(pLocaleDisplayNames);
}
};
struct UResourceBundleCloser
{
void operator()(UResourceBundle* pResourceBundle) const
{
ures_close(pResourceBundle);
}
};
typedef IcuHolder<UCalendar, UCalendarCloser> UCalendarHolder;
typedef IcuHolder<UEnumeration, UEnumerationCloser> UEnumerationHolder;
typedef IcuHolder<UDateTimePatternGenerator, UDateTimePatternGeneratorCloser> UDateTimePatternGeneratorHolder;
typedef IcuHolder<UDateFormat, UDateFormatCloser> UDateFormatHolder;
typedef IcuHolder<UNumberFormat, UNumberFormatCloser> UNumberFormatHolder;
typedef IcuHolder<ULocaleDisplayNames, ULocaleDisplayNamesCloser> ULocaleDisplayNamesHolder;
typedef IcuHolder<UResourceBundle, UResourceBundleCloser> UResourceBundleHolder;
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